Changing UI elements in Chaquopy

Question

I am currently trying to find out how to change the text of my textview in my MainActivity(the UI is written in Java) from a Python module. I know I have to pass my mainactivity somehow to my python module, but I still can't figure out how to do it properly. I'm using the Chaquopy SDK for python interaction.

My main activity looks like this right now

import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main); //set the layout
        final TextView simpleTextView = (TextView) findViewById(R.id.simpleTextView); //get the id for TextView
        Button changeText = (Button) findViewById(R.id.btnChangeText); //get the id for button
        changeText.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                simpleTextView.setText("After Clicking"); //set the text after clicking button
            }
        });
    }


}

Now I would need a function in python to be able to manipulate the textview.

Thanks in advance.

Answer 1

In summary, what you'll need to do is:

• Add your Python module to the source code in the appropriate location.
• Load your Python module using getModule, and call the Python function using callAttr (see the Java API documentation).

Specifically, you could either:

• Have the Python function return a string, then have the Java code pass it to setText. For example, setText(mod.callAttr(...).toString()), where mod is the return value of getModule.

Or:

• Pass the TextView object to the Python function using callAttr, then have the Python code call setText. For example, if your Python function is called f, then you would write mod.callAttr("f", simpleTextView), and the function would receive the TextView as its argument.